1851066906 has 32 divisors (see below), whose sum is σ = 4196754240. Its totient is φ = 539581824.

The previous prime is 1851066901. The next prime is 1851066929. The reversal of 1851066906 is 6096601581.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1851066901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623035 + ... + 625998.

It is an arithmetic number, because the mean of its divisors is an integer number (131148570).

Almost surely, 2^1851066906 is an apocalyptic number.

1851066906 is an abundant number, since it is smaller than the sum of its proper divisors (2345687334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1851066906 is a wasteful number, since it uses less digits than its factorization.

1851066906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249070.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 1851066906 is about 43024.0270779015. The cubic root of 1851066906 is about 1227.8369691117.

The spelling of 1851066906 in words is "one billion, eight hundred fifty-one million, sixty-six thousand, nine hundred six".